A low temperature stop valve, Unlike Example 1, Comprises a valve body 1 and a valve cover 2, A valve stem 3 is arrange in that valve body 1, One end of the valve stem 3 is provided with a valve disc 4, The other end of the valve stem 3 is provided with an adjusting handwheel 5, A low portion of that disc 4 is provided with a guide sleeve 6, The guide sleeve 6 is fixed by means of a connecting piece and a spring pad 8, Between that disc 4 and the guide sleeve 6 is provide a valve seat 7, Between that valve stem 3 and the valve cov 2 there is provided a packing assembly 9, An O-ring 10 is further dispose at that upper portion of the packing assembly 9, An upper part of that O-ring 10 is provide with a packing gland 11, The valve body 1 is provided with an arc-shaped end face 12, the arc-shaped end face 12 forms a line seal between the valve body 1 and the valve seat 7, the contact end of the valve disc 4 and the valve seat 7 is provided with a water grain surface 41, the packing assembly 9 comprises a flexible graphite packing layer, the valve body 1 is provided with a liquid inlet cavity and a liquid outlet cavity, the two O-rings 10 are concentric arranged, and the inner diameter and outer diameter of the two O-rings are different.接着，众人又商议在正月十五这天两家互换信物，作为聘礼，郑家摆酒，只请张家人为证，省得张扬开来。? The direction of industrial Internet is to build an ecosystem of intelligent manufacturing, which is the subversion of software, network, big data and other service modes in the industrial field. Industrial Internet is to realize the interconnection of all machines, not just the machinery and equipment of manufacturing factories, and finally realize the integration of machines and machines, and the integration of people and machines.一桩强暴案件震惊了整个德里，副警务处长瓦尔迪卡·查图尔维迪展开对凶犯的艰苦搜寻。改编自 2012 年印度黑公交轮奸案。4: Fake fabrics are hard and really soft. This is the hard injury of fake fabrics, and so is NIKE elite socks.The te finds that it is blocking page response information from the browser, Forward the information you don't need, Find the information you need, The corresponding information will also be loaded through the Forward page, The following figure shows BurpSuite's interception page: 2.2. BurpSuite Replay Attack 2.2. 1 Replay Attack Replay Attacks, also known as Replay Attacks, Replay Attacks or FreshnessAttacks, refers to the attacker sending a packet received by the destination host to deceive the system, which is mainly used in the identity authentication process and destroys the correctness of authentication. It is a type of attack that repeats an effective data transmission maliciously or fraudulently. The replay attack can be carried out by the initiator or by the enemy that intercepts and retransmits the data. Attackers use network monitoring or other means to steal authentication credentials and then re-send them to the authentication server. From this explanation, encryption can effectively prevent session hijacking, but it cannot prevent replay attacks. Replay attacks can occur during any network communication. Replay attack is one of the common attacks used by hackers in the computer world. Its written definition is abstract to people who do not know cryptography. However, through learning, we know that the best way to defend against replay attacks is timestamp. Simply speaking, what is timestamp, that is, the verification code that we need to enter when visiting some websites to log in, and replay attacks cannot cope with every time we log in.
